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2 Sheets-Sheet 1.

(No Model.)

E. KEITH. GRAIN SGOURER.

No. 570,000. Patented Nov. 3, 18-00.

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(No Model.) 2 She'ets-Sheef2.

E. KEITH. GRAIN SGOURER.

Patented Nov. 3, 189 6."

UNITED STATES PATENT OFFICE.

ELGIN KEITH, OF SILVER CREEK, NEV YORK, ASSIGNOR TO THE HOWES GRAINCLEANER COMPANY, OF SAME PLACE.

GRA|N-SCOURER..

SPECIFICATION forming part of Letters Patent N 0. 570,600, datedNovember 3, 1896. Application filedJHllQ 25, 1896- Serial NO. 596,851-(NO 11106.81.)

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Be it known that I, ELGIN KEITH, a citizen of the United States,residing at Silver Creek, in the county of Chautauqua, in the State ofNew York, have invented a new and useful Improvement-in Grain-Scourers,of which the following is a specification.

This invention relates to that class of grain-scourers in which thescouring mechanism is combined with suction spouts through which thedust and other light impurities are drawn oft.

The object of my invention is to so organize the air and dust passagesof the scouring mechanism that the apparatus is simple and compact andthat the separated impurities are completely carried on.

The machine illustrated in the accompanying drawings and described inthis specification is more especially designed for cleanin g andpolishing malt, but my improvements are also applicable tograin-scourers used for other purposes.

In the accompanying drawings, consisting of two sheets, Figure l is aside elevation, partly in section, of my improved graincleaning machine.Fig. 2 is a horizontal section in line 2 2, Fig. 1. Fig. 3 is a verti-,cal transverse section in line 3 3, Fig. 1. Fig. 4: is a fragmentaryvertical section taken in the same plane as Fig. 1 and showing thescouring mechanism on an enlarged scale.

Like letters of reference refer to like parts in the several figures.

A represents the main frame of the grain cleaner or separator; B, theshaking-shoe, which is provided with a number of inclined screens; 0, avertical air-trunk opening with its lower end over the receiving end ofthe shaking-shoe; D, a chess-hopper connected with the upper end of thevertical air-trunk, and E the fan-case, having its eyes connected withthe chess-hopper by air-trunks c, all of which parts may be of anysuitable and wellknown construction.

F represents the casing of the scouring mechanism, which is arranged infront of the vertical air-trunk and which is provided in its upperportion with a feed-hopper f.

brush arranged horizontally below the outlet of the feed-hopper andextending transversely from one end of the scouringcase to the other.This brush is mounted on a shaft g, which extends through the end wallsof the scouring-case and is turned so that its front side movesdownwardly.

H represents a scouring-concave which incloses the front, rear, andlower sides of the scouring-drum and which consists of a sheet offlexible perforated metal. The curved edges of the concave rest looselyupon curved flanges or shoulders h, secured to the inner sides of theadjacent end walls of the scouring-case, and the rear end of the concaveis bent into the form of a hook h. The latter engages with a transversebar I, supported with its ends on the end walls of the scouring-case andseparated by an intervening space from the adjacent inner wall of thescouring-case. The rear wall f of the hopper is arranged with its lowerend about midway between the front and rear ends of the concave,wherebythe grain is directed between the downwardly-moving front portion of thedrum and the concave, and the grain is discharged by the upwardly-movingrear portion of the drum between the rear end of the concave and therear wall of the hopper. The front end of the concave is arrangedadjacent. to the lower end of the front wall of the hopper and issecured to the lower ends of two adj usting-rods J J, whereby theconcave is adjusted toward or from the scouringdrum for regulating thescouring action. These rods are arranged in front of the fronthopper-wall and are provided at their upper screw-threaded ends, whichpass through openings in the top of the scouring-case, with screw-nutsj, bearing against the top of the scouring case. screw-nuts the concaveis drawn closer to the drum, and upon loosening these nuts the concaveis permitted to move away from the drum. This construction of ascouring-concave and the means for adjusting the same is extremelysimple and is not liable to get out of order.-

Upon tightening the K represents a grain'spout whereby thescouring-concave were again mixed with the grain as it escapes from theconcave is delivered into the vertical air-trunk.

L represents a dust-chamber which is arranged in the scouring-case belowthe scouring-concave and which receives the fine impurities which aredetached from the grain by the scouring-drum and pass through theperforations in the scouring-concave. The bottom of the dust-chamberconsists of two boards m, which incline from the central portion of thechamber in opposite directions to ward the end walls thereof.

N represents a vertical air inlet pipe which opens with its upper endinto the dust-chamber between the inner or elevated ends of the bottomsections and which is provided in its lower end with a slide-valve 01,whereby the admission of air may be regulated. Each end of thedust-chamber is connected with the suction of the fan by a pipe 0, whichopens with its receiving end through one of the end' walls of thedust-chamber just above the base of one of the inclined bottom sectionsand with its delivery end into one of the airtrunks e. The current ofair which enters the dust-chamber through the central inlet carries thedust which falls into the dustchamber toward opposite ends of the latterand from thence through the air-pipes 0 to the fan. By inclining thebottom sections of the dust-chamber from the inner toward the outer endsthe dust is prevented from settling thereon.

In grain-cleaning machines of this character as heretofore constructedthe particles of dirt and dust which were detached from the grain andpassed through the perforated grain, making it necessary to againseparate the dirt by the air-separator.

In my improved separatingmachine the detached dust as it passes throughthe scourin g-concave is carried directly to the fan without being againmixed with the grain, thereby increasing the capacity of the machine andimproving the quality of the work.

I claim as my invention- 1. The combination with a perforatedscouring-shell, a fan and an air-trunk connecting the grain-outlet ofsaid shell with the fan, of a dust-chamber arranged below saidscouringshell and having its bottom inclined,said dustchamber having anair-inlet at the upper end of said inclined bottom and a dust-outlet atthe lower end thereof, and a separate airspout extending from saiddust-outlet to said fan, substantially as set forth.

2. The combination with a perforated scou ring-shell, a fan, and anair-trunk connecting the grain-outlet of said shell with the fan, of a dust-chamber arranged below said scouringshell and having its bottominclined from the middle of said shell toward both ends thereof, saiddust-chamber having an air-inlet at the raised middle portion of itsbottom and dust-outletsat the lower ends of said bottom, and air-spoutsextending from said dust-outlets to said fan, substantially as setforth.

Vitness my hand this 18th day of June, 1896.

ELGIN KEITH.

IVitnesses:

LEON II. BRAND, C. W. GRASHO.

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